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URLs in external links

External links can start with "http://" or "ftp://"; "file://" does not work.

In external links, all symbols of the URL must be among: A-Z a-z 0-9 ._\/~%-+&#?!=()@. If a URL contains a different character it should be converted; for example, ^ has to be written %5e, the hexadecimal ASCII value with a percent sign in front. A blank space can also be converted into an underscore.